厚层复杂岩性油藏的储层精细表征及对开发的影响——以渤海湾石臼坨地区A油田沙一、沙二段油藏为例

doi:10.11743/ogg20150516

摘要/Abstract

摘要： 渤海湾石臼坨地区A油田沙一、沙二段油藏是近年来少见的海上复杂岩性、高产厚层油藏，其储层普遍发育灰质砂岩、鲕粒白云岩、白云质砂岩等6类岩性。针对该油田储层岩性复杂、中-深层储层地震资料品质较差、评价井井距大、扇三洲储层表征难度大、储层空间分布认识不清等难点，应用元素俘获谱（ECS）测井、岩心、分析化验和地震等资料，采用井-震联合技术路线，建立了厚层复杂岩性油藏的储层精细表征“四步法”技术体系，即：基于岩石相的储层分类评价技术、基于古地貌分析的沉积模式研究技术、精细等时沉积地层格架的构建方法和基于相控约束的储层预测方法。基于该技术体系，将沙一、沙二段储层纵向精细化为5期砂体，并识别出每期砂体的平面分布，同时预测了不同类型储层的空间展布。据此优化了钻探部署，从降低开发风险、提高投资效益考虑，有针对性地暂缓砂体尖灭位置附近的9口开发井钻探，并优选Ⅰ类储层Ⅰ-2砂层作为优先开发储层。该技术体系可为类似油田的可动用储量分析、层系划分及井网优化等提供技术支撑。

关键词: 厚层, 复杂岩性, 古地貌, 沉积模式, 等时格架, 储层分类, 渤海湾盆地

Abstract: The 1^st and 2^nd Members of Shahejie Formation in A oilfield in Shijiutuo uplift,Bohai Bay Basin,are rare proli-fic thick reservoirs with complex lithologies.Six lithologies are identified,mainly including limy sandstones,oolitic dolomites,dolomitic sandstones.There are various factors challenging reservoir description of the A oilfield,including complex lithologies,poor quality of seismic data,and sparse appraisal wells,large difficulty of fan delta reservoir description,and poor understanding of reservoir spatial distribution.This paper applied a well-logging and seismic comprehensive method,i.e.‘four step’ method,using ECS logging,core and seismic data.It consists of reservoir rock typing based on sedimentary facies,sedimentary modeling based on paleo-geomorphy restoration,reservoir framework reconstructing based on fine isochronous stratigraphy and reservoir prediction based on facies constraints.By using this four step method,sandbodies of 5 phases are identified and mapped in the 1^st and 2^nd Members of Shahejie Formation.In addition,good-quality reservoirs are predicted by using seismic technique,and 9 new development wells are proposed for emplacement on the Ⅰ-2 sand body with type Ⅰ reservoirs.This ‘four step’ method is very useful in estimating producible oil reserves,layer division,and well pattern optimization in similar oilfields.

Key words: thick-layer, complex lithology, paleo-geomorphology, sedimentary model, isochronous stratigraphy, reservoir typing, Bohai Bay Basin

中图分类号:

TE122.2

胡晓庆,范廷恩,王晖,等. 厚层复杂岩性油藏的储层精细表征及对开发的影响——以渤海湾石臼坨地区A油田沙一、沙二段油藏为例[J]. 石油与天然气地质, 2015, 36(5): 835-841. doi: 10.11743/ogg20150516 Hu Xiaoqing,Fan Tingen,Wang Hui,et al. Fine characterization of thick reservoirs with complex lithologies and its influence on oil recovery —A case from reservoirs of the 1^st and 2^nd Members of Shahejie Formation in A oilfield, Shijiutuo uplift in Bohai Bay Basin[J]. Oil & Gas Geology, 2015, 36(5): 835-841. doi: 10.11743/ogg20150516

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